Image and Signal Processing Methods

Spectral feature selection and classification of roofing materials using field spectroscopy data

[+] Author Affiliations
Sarah Hanim Samsudin, Alireza Hamedianfar

Universiti Putra Malaysia (UPM), Department of Civil Engineering, Faculty of Engineering, Serdang 43400, Selangor, Malaysia

Helmi Z. M. Shafri, Shattri Mansor

Universiti Putra Malaysia (UPM), Department of Civil Engineering, Faculty of Engineering, Serdang 43400, Selangor, Malaysia

Universiti Putra Malaysia (UPM), Geospatial Information Science Research Centre (GISRC), Faculty of Engineering, Serdang 43400, Selangor, Malaysia

J. Appl. Remote Sens. 9(1), 095079 (May 28, 2015). doi:10.1117/1.JRS.9.095079
History: Received February 12, 2015; Accepted April 30, 2015
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Abstract.  Impervious surface discrimination and mapping are important in urban and environmental studies. Confusion in discriminating urban materials using multispectral systems has led to the use of hyperspectral remote sensing data as an effective way to improve urban analysis. However, the high dimensionality of these data needs to be reduced to extract significant wavelengths useful in roof discrimination. Therefore, this research used feature selection algorithms of the support vector machine (SVM), genetic algorithm (GA), and random forest (RF) to select the most significant wavelengths, and the separability between classes was assessed using the SVM classification. Accordingly, the visible, shortwave infrared-1, and shortwave infrared-2 regions were most important in distinguishing different roofing materials and conditions. A comparative analysis of the feature selection models showed that the highest accuracy of 97.53% was obtained using significant wavelengths produced by RF. Accuracy of spectra without feature selection was also investigated, and the result was lower compared with classification using significant wavelengths, except for the accuracy of roof type classification, which produced an accuracy similar to SVM and GA (96.30%). This study offers new insight into within-class urban spectral classification, and the results may be used as the basis for the development of urban material indices in the future.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Sarah Hanim Samsudin ; Helmi Z. M. Shafri ; Alireza Hamedianfar and Shattri Mansor
"Spectral feature selection and classification of roofing materials using field spectroscopy data", J. Appl. Remote Sens. 9(1), 095079 (May 28, 2015). ; http://dx.doi.org/10.1117/1.JRS.9.095079


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